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<< Ya 3Dmark is prolly the only benchmark you will see a noticeable increase by just bumping the core. Load up UT, Q3, and any other real game, and the core bump'age just don't matter. >>
I find it hard to believe that 750 points in 3dmark translates to no gaming gains. >>
Actually, once you get into the 7000+ 3dmarks range, it really doesn't make that much of a difference. All those extra points don't translate into too much (5 or 6 fps in the first 4 benches), and the majority of the increase is in the "nature" game which compares to few games out today. Games like UT, Q3 and older generation games are equivalent to the low-end benchmarks, and are probably closer to 3dmark2000 benches. You just won't see much of a difference at all when your frames are already ~130 fps.
Chiz